lkml.org 
[lkml]   [2015]   [Sep]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.1 019/159] arm64: set MAX_MEMBLOCK_ADDR according to linear region size
    Date
    4.1-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

    commit 34ba2c4247e5c4b1542b1106e156af324660c4f0 upstream.

    The linear region size of a 39-bit VA kernel is only 256 GB, which
    may be insufficient to cover all of system RAM, even on platforms
    that have much less than 256 GB of memory but which is laid out
    very sparsely.

    So make sure we clip the memory we will not be able to map before
    installing it into the memblock memory table, by setting
    MAX_MEMBLOCK_ADDR accordingly.

    Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
    Tested-by: Stuart Yoder <stuart.yoder@freescale.com>
    Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/include/asm/memory.h | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/arch/arm64/include/asm/memory.h
    +++ b/arch/arm64/include/asm/memory.h
    @@ -114,6 +114,14 @@ extern phys_addr_t memstart_addr;
    #define PHYS_OFFSET ({ memstart_addr; })

    /*
    + * The maximum physical address that the linear direct mapping
    + * of system RAM can cover. (PAGE_OFFSET can be interpreted as
    + * a 2's complement signed quantity and negated to derive the
    + * maximum size of the linear mapping.)
    + */
    +#define MAX_MEMBLOCK_ADDR ({ memstart_addr - PAGE_OFFSET - 1; })
    +
    +/*
    * PFNs are used to describe any physical page; this means
    * PFN 0 == physical address 0.
    *



    \
     
     \ /
      Last update: 2015-09-26 23:41    [W:4.145 / U:0.296 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site